An electrode raw material stirring device for sodium ion battery processing

Abstract

The utility model discloses an electrode raw material stirring equipment for sodium ion battery processing, including stirring drum, be provided with stirring subassembly in the stirring drum inside, the first stirring layer, second stirring layer, third stirring layer are set gradually from top to bottom to the stirring subassembly, and the motor group is set in the stirring drum top, the utility model discloses through three axle coaxial nesting stirring shaft group and independent speed control unit, aiming at the upper layer gas liquid mixing failure problem, and the first stirring layer is by the exclusive motor drive, to accurate low -speed operation maintenance gas liquid interface stability, ensure the protection atmosphere cycle full, effectively restrain bubble breakage and atmosphere escape, eliminate the slurry oxidation risk. Aiming at the middle layer agglomeration broken problem, the second stirring layer independent high -speed operation provides high -speed shearing homogenization force field, realizes partial agglomerate efficient breakage, avoids high -speed overheating or component degradation simultaneously, guarantees the even dispersion of conductive agent, promotes the battery rate performance.

Description

Technical Field

[0001] This utility model relates to a stirring device for electrode raw materials used in sodium-ion battery processing, belonging to the technical field of stirring equipment. Background Technology

[0002] Sodium-ion batteries, as the core of novel energy storage technology, rely heavily on the uniformity and stability of their electrode slurry to determine the battery's energy density, cycle life, and safety. During electrode processing, raw materials (such as active materials, conductive agents, and binders) must be precisely stirred under a protective atmosphere to achieve key process requirements such as gas-liquid interface stability, agglomeration and breakup, and prevention of sedimentation.

[0003] Currently, the industry generally uses single-shaft or simple double-layer mixing systems, whose speed and function cannot be decoupled. In the upper low-speed gas-liquid mixing, the protective atmosphere (such as argon) needs to circulate at a low speed to maintain the stability of the gas-liquid interface, but existing equipment can only adjust the speed as a whole. High-speed operation causes bubble bursting and atmosphere dissipation, leading to slurry oxidation.

[0004] While the breakup of mid-layer agglomerates relies on high shear force, high speed can easily cause local overheating or component degradation at a single rotation speed, while low speed cannot effectively disperse the agglomerates, resulting in poor slurry uniformity (such as uneven distribution of conductive agents) and affecting the rate performance of the battery.

[0005] Low-speed, high-force scraping is required for bottom settling, but the traditional scraper is linked to the main agitator, and the speed is not properly matched, causing the slurry to separate (settling rate > 5%), resulting in coating defects and batch scrapping.

[0006] Traditional mixing equipment struggles to meet diverse needs, necessitating a solution that allows for precise, layered control to improve slurry consistency and adapt to large-scale production. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a stirring device for electrode raw materials in sodium-ion battery processing, so as to solve the problems of the existing technology.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: A stirring device for electrode raw materials used in sodium-ion battery processing includes a stirring tank, a stirring assembly disposed inside the stirring tank, a first stirring layer, a second stirring layer, and a third stirring layer disposed sequentially from top to bottom in the stirring assembly, and a motor unit disposed above the stirring tank. The motor unit drives the first stirring layer, the second stirring layer, and the third stirring layer respectively through three completely coaxial nested stirring shafts. The control unit is electrically connected to the motor set. Through the independent speed regulation of the control unit and the motor set, the first stirring layer achieves low-speed gas-liquid mixing and protective atmosphere circulation, the second stirring layer achieves high-shear homogenization and local agglomeration and breakup, and the third stirring layer achieves low-speed strong bottom scraping and anti-settling, thus realizing independent control of the speed and function of the three stirring layers.

[0009] As a further improvement, the first stirring layer includes several 45° upward-sloping blade turbine stirring blades, and the stirring shaft assembly includes a first rotating shaft disposed on the outermost layer, wherein the upward-sloping blade turbine stirring blades are welded to the outer ring surface of the first rotating shaft.

[0010] As a further improvement, the second stirring layer includes several sets of staggered shearing rods, and the stirring shaft group includes a second rotating shaft disposed through and below the first rotating shaft, and the shearing rods are fixedly welded to the outer ring surface of the second rotating shaft.

[0011] As a further improvement, the third stirring layer includes a conical wheel cylinder with helically inserted blades on the outer annular surface of the conical wheel cylinder. The stirring shaft assembly includes a third rotating shaft disposed through the first rotating shaft and the second rotating shaft. The third rotating shaft abuts against the bottom of the stirring tank, and the conical wheel cylinder is fixedly installed on the outer annular surface of the third rotating shaft.

[0012] As a further improvement, the first and second rotating shafts are hollow, and the third rotating shaft is a solid shaft. The second rotating shaft includes a first connecting part that passes through the first rotating shaft and a first outer part with the same outer diameter as the first rotating shaft. The third rotating shaft includes a second connecting portion that passes through the second rotating shaft, and a second outer connecting portion that has the same outer diameter as the first rotating shaft; The concentricity of the first, second, and third rotating shafts is ≤0.05 mm.

[0013] As a further improvement, a first toothed plate is welded to the outer ring above the first rotating shaft, a second toothed plate is welded to the outer ring above the second rotating shaft, and a third toothed plate is welded to the outer ring above the third rotating shaft. The motor assembly includes a first motor that drives the first rotating shaft, a second motor that drives the second rotating shaft, and a third motor that drives the third rotating shaft. The first motor, the second motor, and the third motor are electrically connected to the control unit. Gears are installed on the output shafts of the first motor, the second motor, and the third motor, and different sets of gears mesh with the first gear, the second gear, and the third gear respectively.

[0014] As a further improvement, the upward-sloping folded blade turbine impeller has a 4-6 blade folded blade structure, with the blade tips tilting upward at an angle of 40° to 50°.

[0015] As a further improvement, the shearing rod has a serrated side, and the diameter of the shearing rod is 0.45 to 0.55 times the inner diameter of the mixing tank.

[0016] As a further improvement, the conical wheel cylinder has a hollow structure and is made of polytetrafluoroethylene or PEEK material.

[0017] As a further improvement, a sealed bearing is provided between the first rotating shaft and the first connecting part, and between the second rotating shaft and the second connecting part.

[0018] Beneficial effects: This invention addresses the issue of upper-layer gas-liquid mixing failure through a three-axis coaxial nested stirring shaft assembly and an independent speed control unit. The first stirring layer, driven by a dedicated motor, operates at precise low speed to maintain a stable gas-liquid interface, ensuring sufficient circulation of the protective atmosphere, effectively suppressing bubble bursting and atmosphere escape, and eliminating the risk of slurry oxidation. To address the problem of insufficient agglomeration and breakup in the middle layer, the second stirring layer operates independently at high speed, providing a high-shear homogeneous force field to achieve efficient breakup of localized agglomerates while avoiding high-speed overheating or component degradation, ensuring uniform dispersion of the conductive agent and improving battery rate performance. To address the lack of bottom settling control, the third stirring layer operates continuously in a low-speed, high-force scraping mode, dynamically preventing slurry stratification and controlling the settling rate to below 2%, eliminating coating defects and batch rejection risks.

[0019] During operation, operators preset process parameters for each layer via the control unit, and the motor unit synchronously adjusts the speed of the three nested shafts according to the instructions. The upper layer maintains protective gas circulation at 20 revolutions per minute, the middle layer performs high-shear homogenization at 1,500 revolutions per minute, and the bottom layer performs bottom scraping and anti-settling at 15 revolutions per minute, with stirring completed entirely in an argon atmosphere. This design achieves complete decoupling of speed and function, ensuring that the three major process requirements of gas-liquid mixing, agglomeration and breakup, and anti-settling are achieved simultaneously and precisely. This improves slurry consistency and production efficiency. By independently controlling the speed of each layer, it avoids speed conflicts common in traditional equipment, reduces process debugging time by more than 30%, lowers the standard deviation of slurry uniformity by 40%, and steadily increases the yield to 92%.

[0020] Compared to existing single-axis or dual-layer systems, this system fully covers multi-dimensional process requirements, not only meeting the stringent requirements for slurry stability in large-scale sodium-ion battery production, but also reducing batch scrap rate to one-third of the industry average. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional structural diagram of a stirring device for electrode raw materials used in sodium-ion battery processing according to this utility model.

[0023] Figure 2 This is a three-dimensional structural diagram of a stirring device for electrode raw materials used in sodium-ion battery processing according to this utility model.

[0024] Figure 3 This is a detailed structural diagram of the internal structure of a stirring device for electrode raw materials used in sodium-ion battery processing, according to this utility model.

[0025] Figure 4 yes Figure 1 Enlarged structural diagram at point A in the middle.

[0026] Figure 5 yes Figure 1 Enlarged structural diagram at point B.

[0027] Figure 6 yes Figure 1 Enlarged structural diagram at point C.

[0028] Figure 7 yes Figure 1 Enlarged structural diagram at point D.

[0029] Figure 8 This is a schematic diagram of the modular connection structure of a stirring device for electrode raw materials in sodium-ion battery processing according to this utility model.

[0030] 1. Mixing tank; 2. Mixing assembly; 21. First mixing layer; 22. Second mixing layer; 23. Third mixing layer; 3. Motor unit; 4. Control unit; 211. Inclined blade turbine impeller; 212. First rotating shaft; 221. Shearing rod; 2211. Serrated part; 222. Second rotating shaft; 223. First connecting part; 224. First external connection part; 231. Conical wheel cylinder; 232. Blade; 233. Third rotating shaft; 234. Second connecting part; 235. Second external connection part; 31. First toothed blade; 32. Second toothed blade; 33. Third toothed blade; 34. First motor; 35. Second motor; 36. Third motor; 5. Sealed bearing. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Reference Figure 1-8 As shown, a stirring device for electrode raw materials for sodium-ion battery processing includes a stirring tank 1, a stirring assembly 2 disposed inside the stirring tank 1, a first stirring layer 21, a second stirring layer 22, and a third stirring layer 23 disposed sequentially from top to bottom in the stirring assembly 2, and a motor unit 3 disposed above the stirring tank 1. The motor unit 3 drives the first stirring layer 21, the second stirring layer 22, and the third stirring layer 23 respectively through three completely coaxial nested stirring shafts. Control unit 4 is electrically connected to motor group 3. Through independent speed regulation and coordination between control unit 4 and motor group 3, the first stirring layer 21 achieves low-speed gas-liquid mixing and protective atmosphere circulation, the second stirring layer 22 achieves high-shear homogenization and local agglomeration and breakup, and the third stirring layer 23 achieves low-speed strong bottom scraping and anti-settling, thus realizing independent control of the speed and function of the three stirring layers.

[0034] By employing a three-axis coaxial nested stirring shaft assembly and an independent speed control unit 4, the first stirring layer 21, driven by a dedicated motor, addresses the issue of upper-layer gas-liquid mixing failure. This precise low-speed operation maintains a stable gas-liquid interface, ensuring sufficient circulation of the protective atmosphere, effectively suppressing bubble bursting and atmosphere escape, and eliminating the risk of slurry oxidation. To address the issue of insufficient agglomeration and breakup in the middle layer, the second stirring layer 22 operates independently at high speed, providing a high-shear homogeneous force field to efficiently break up localized agglomerates while avoiding high-speed overheating or component degradation. This ensures uniform dispersion of the conductive agent and improves battery rate performance. To address the lack of bottom settling control, the third stirring layer 23 operates continuously in a low-speed, high-force scraping mode, dynamically preventing slurry stratification and controlling the settling rate to below 2%, eliminating coating defects and batch rejection risks.

[0035] During equipment operation, operators preset process parameters for each layer via control unit 4, and motor unit 3 synchronously adjusts the rotation speed of the three nested shafts according to the instructions. The upper layer maintains protective gas circulation at 20 revolutions per minute, the middle layer performs high-shear homogenization at 1,500 revolutions per minute, and the bottom layer performs bottom scraping and anti-settling at 15 revolutions per minute, with stirring completed entirely in an argon atmosphere. This design achieves complete decoupling of rotation speed and function, ensuring that the three major process requirements of gas-liquid mixing, agglomeration and breakup, and anti-settling are achieved simultaneously and accurately. This improves slurry consistency and production efficiency. By independently controlling the rotation speeds of each layer, it avoids the speed conflicts of traditional equipment, reduces process debugging time by more than 30%, lowers the standard deviation of slurry uniformity by 40%, and steadily increases the yield to 92%.

[0036] Compared to existing single-axis or dual-layer systems, this system fully covers multi-dimensional process requirements, not only meeting the stringent requirements for slurry stability in large-scale sodium-ion battery production, but also reducing batch scrap rate to one-third of the industry average.

[0037] As a further improvement, the first stirring layer 21 includes a plurality of 45° upward-sloping blade turbine stirring blades 211, and the stirring shaft assembly includes a first rotating shaft 212 disposed on the outermost layer, and the upward-sloping blade turbine stirring blades 211 are welded to the outer ring surface of the first rotating shaft 212.

[0038] The upward-sloping folded blade turbine impeller 211 has a 4-6 blade folded blade structure, and the blade 232 has an upward tilt angle of 40°-50° at the end.

[0039] The upward-sloping folded-blade turbine agitator 211, with its 45° inclination and 4 to 6-blade folding structure, is specifically optimized for the upper-layer gas-liquid mixing process. This inclination angle generates a highly efficient axial flow field at low speeds, promoting uniform dispersion of the protective gas to the slurry interface and preventing violent bubble disturbance and collapse. The 4 to 6 blades ensure maximum mixing efficiency while suppressing energy overload and preventing the formation of dead zones in the flow field at low speeds. The upward-curving 40° to 50° angle at the end of the upward-sloping folded-blade turbine agitator 211 enhances gas circulation dynamics, guiding argon gas to rise gently along the wall of the mixing tank, maintaining a stable gas-liquid interface and eliminating the risk of atmosphere escape.

[0040] In this embodiment, to save materials and labor, the inclined folding blade turbine agitator 211 is configured with 4 blades.

[0041] In practical applications, the first stirring layer 21 operates at a low speed of 20 revolutions per minute. The upward-sloping blade turbine impeller 211, rigidly connected to the outer ring of the first rotating shaft 212, continuously generates gentle radial thrust and axial lifting force. This operating mode precisely adapts to the requirements of protective atmosphere circulation, improving gas distribution uniformity by more than 35% and reducing slurry oxidation rate to below 0.5%. It effectively solves the core defects of traditional equipment, such as bubble bursting and atmosphere loss during high-speed operation due to overall speed regulation, ensuring that the sodium-ion battery electrode slurry is in a stable protective atmosphere throughout the processing, significantly improving slurry chemical consistency and battery yield.

[0042] The staggered shear bars 221 are precisely adapted to the high-shear homogenization process requirements in the middle layer through geometric optimization and flow field control. The second stirring layer 22 includes several sets of staggered shear bars 221, and the stirring shaft group includes a second rotating shaft 222 disposed below and passing through the first rotating shaft 212. The shear bars 221 are fixedly welded to the outer ring surface of the second rotating shaft 222.

[0043] The shearing rod 221 has a serrated side 2211, and the diameter of the shearing rod 221 is 0.45 to 0.55 times the inner diameter of the mixing tank 1.

[0044] The high-intensity micro-turbulence generated by the serrated part 2211 on the side of the shear rod 221 during high-speed rotation effectively breaks up the local agglomerates of active materials and conductive agents, avoiding uneven slurry caused by large particle residues. The sharp-angled structure of the serrated edge enhances the shear force density, improving the agglomeration and breaking efficiency by more than 40%, while suppressing the risk of local overheating under high-speed operation. The diameter of the shear rod 221 is set to 0.45 to 0.55 times the inner diameter of the mixing tank 1 to ensure optimal matching between the flow field coverage and energy consumption. If the diameter is too small, the shearing area will be insufficient; if it is too large, it will cause ineffective turbulence and energy loss. This ratio maintains a stable high shear force field, ensuring uniform dispersion of components without causing binder degradation.

[0045] In actual operation, the second stirring layer 22 is driven by a dedicated motor, operating independently at a high speed of 1500 revolutions per minute, while the shearing rod 221 rotates synchronously through the rigid welded structure on the outer ring of the second rotating shaft 222. The serrated part 2211 forms an interlaced shearing grid in the slurry, specifically crushing the conductive agent agglomerates and controlling the standard deviation of particle distribution to below the micrometer level.

[0046] This solution addresses the insufficient dispersion issues caused by the single rotation speed of traditional equipment: at low speeds, agglomerates cannot be effectively broken up, while at high speeds, overall overheating damages the slurry's stability. Ultimately, it significantly improves slurry uniformity, reduces battery rate performance fluctuations by over 25%, and eliminates coating defects and capacity decay caused by residual agglomerates.

[0047] The conical wheel cylinder 231 structure of the helical insert blades 232 is optimized for bottom anti-settling process requirements. The third stirring layer 23 includes a conical wheel cylinder 231, with helical insert blades 232 on the outer ring surface of the conical wheel cylinder 231. The stirring shaft assembly includes a third rotating shaft 233 disposed through the first rotating shaft 212 and the second rotating shaft 222. The third rotating shaft 233 abuts against the bottom of the stirring tank 1, and the conical wheel cylinder 231 is fixedly installed on the outer ring surface of the third rotating shaft 233.

[0048] The conical wheel cylinder 231 has a hollow structure and is made of polytetrafluoroethylene or PEEK material.

[0049] The spiral blades 232 generate a high-intensity radial scraping force field when rotating at low speed, which effectively removes the sediment particles at the bottom of the tank and prevents the slurry from separating. The hollow structure significantly reduces rotational inertia, improves low-speed, high-torque output efficiency, and avoids energy overload and response lag caused by excessive weight. The conical wheel 231 is made of polytetrafluoroethylene or PEEK material, which, with its ultra-low coefficient of friction and excellent chemical resistance, completely eliminates slurry adhesion and equipment wear, ensuring long-term cleanliness and high efficiency of the scraping surface; The design of the third rotating shaft 233 rigidly abutting against the bottom of the barrel enhances mechanical stability, eliminates vibration interference, and ensures that the scraping action accurately covers the entire bottom area.

[0050] In actual operation, the third stirring layer 23 operates independently at a low speed of 15 revolutions per minute, and the conical wheel 231 is driven by the third rotating shaft 233 to continuously scrape the bottom of the tank. The spiral blades 232 dynamically peel off the sedimentation layer, keeping the sedimentation rate stably controlled below 2%, completely solving the problem of improper rotation speed caused by the linkage between the scraper and the main shaft in traditional equipment: insufficient scraping force at low speeds leads to particle accumulation, and disturbance aggravates stratification at high speeds. This mode reduces the concentration gradient at the bottom of the slurry by more than 60%, compresses the coating defect rate to below 1%, and reduces the batch scrap rate to one-third of the industry average, significantly improving the production consistency and yield of sodium-ion battery electrode slurry.

[0051] As a further improvement, the first rotating shaft 212 and the second rotating shaft 222 are hollow, and the third rotating shaft 233 is a solid shaft. The second rotating shaft 222 includes a first connecting part 223 that passes through the first rotating shaft 212 and a first outer part 224 that has the same outer diameter as the first rotating shaft 212. The third rotating shaft 233 includes a second connecting portion 234 that passes through the second rotating shaft 222, and a second outer connecting portion 235 that has the same outer diameter as the first rotating shaft 212; The concentricity of the first rotating shaft 212, the second rotating shaft 222, and the third rotating shaft 233 is ≤0.05 mm.

[0052] A sealed bearing 5 is provided between the first rotating shaft 212 and the first connecting part 223, and between the second rotating shaft 222 and the second connecting part 234.

[0053] The hollow first rotating shaft 212 and the hollow second rotating shaft 222 structure significantly reduce the inertia of rotating parts, reduce motor load and energy consumption, and adapt to the independent speed regulation requirements of the upper low-speed gas-liquid mixing and the middle high-shear homogenization. The solid third shaft 233 provides high torque output at the bottom, ensuring the mechanical strength and stability for bottom scraping and anti-settling, and preventing shaft deformation under low-speed, heavy-load conditions. The first connecting part 223 and the second connecting part 234 adopt an outer diameter matching design to achieve a smooth transition between shafts, eliminate flow field disturbances and vibration sources, and ensure precise and independent mixing force fields for each layer. The concentricity of the three shafts is strictly controlled within 0.05 mm to ensure no eccentric displacement during rotation, and to prevent uneven slurry mixing and equipment wear caused by shaft system deviation.

[0054] Sealed bearings 5 ​​are installed between the first rotating shaft 212 and the first connecting part 223, and between the second rotating shaft 222 and the second connecting part 234, effectively preventing slurry from intruding into the shaft system gaps and preventing corrosion and jamming caused by residual conductive agent and binder. This sealing mechanism maintains the cleanliness of the shaft system in an argon protective atmosphere, avoiding atmosphere leakage and slurry contamination, and ensuring long-term operational reliability. In actual operation, when the three shafts rotate synchronously, concentricity ensures that the rotational speed of each layer is executed independently and accurately. The first layer maintains the gas-liquid interface at 20 revolutions, the second layer breaks up agglomerates at 1500 revolutions, and the third layer scrapes the bottom at 15 revolutions to prevent settling. This configuration completely solves the problems of slurry oxidation caused by shaft leakage in traditional equipment, increased vibration caused by insufficient concentricity, and uncontrolled settling caused by torque mismatch. It improves slurry uniformity by more than 40% and extends equipment maintenance cycle by 50%.

[0055] A first toothed plate 31 is welded to the outer ring above the first rotating shaft 212, a second toothed plate 32 is welded to the outer ring above the second rotating shaft 222, and a third toothed plate 33 is welded to the outer ring above the third rotating shaft 233. The motor assembly 3 includes a first motor 34 that drives the first rotating shaft 212, a second motor 35 that drives the second rotating shaft 222, and a third motor 36 that drives the third rotating shaft 233. The first motor 34, the second motor 35, and the third motor 36 are electrically connected to the control unit 4. Gears are installed on the output shafts of the first motor 34, the second motor 35, and the third motor 36, and different sets of gears mesh with the first gear, the second gear, and the third gear respectively.

[0056] By welding gear plates onto each shaft to form a high-precision meshing interface, motor unit 3 achieves independent power transmission to the three shafts through a dedicated gear system. This configuration ensures that the first motor 34, the second motor 35, and the third motor 36 drive their respective layers at precise speeds, eliminating the speed coupling limitations of traditional single-axis systems. The gear meshing provides high-rigidity torque transmission, maintaining the concentricity of the three shafts within 0.05 mm, avoiding vibration and energy loss, and ensuring speed stability under both low-speed and high-speed conditions.

[0057] In actual operation, control unit 4 is set to operate the first motor at 3420 rpm to maintain upper-layer gas-liquid stability, the second motor at 351500 rpm to perform high-shear homogenization in the middle layer, and the third motor at 3615 rpm to scrape the bottom layer and prevent sedimentation. The precise meshing mechanism of gears and gears allows each layer to operate independently without interference.

[0058] To resolve the conflicting rotation speeds: a low-speed upper layer prevents atmosphere loss and slurry oxidation, a high-speed middle layer efficiently breaks up conductive agent agglomerates without causing component degradation, and a low-speed bottom layer ensures dynamic peeling of bottom particles. This driving method reduces the slurry uniformity standard deviation by more than 40%, controls the settling rate to below 2%, and reduces the batch scrap rate to one-third of the industry average, significantly improving the production consistency and yield of sodium-ion battery electrode slurries.

[0059] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stirring device for electrode raw materials used in sodium-ion battery processing, characterized in that, include: A mixing tank (1) is provided inside the mixing tank (1). The mixing assembly (2) is provided with a first mixing layer (21), a second mixing layer (22), a third mixing layer (23) arranged from top to bottom, and a motor unit (3) arranged above the mixing tank (1). The motor unit (3) drives the first stirring layer (21), the second stirring layer (22), and the third stirring layer (23) respectively through three completely coaxial nested stirring shafts. Control unit (4), which is electrically connected to motor group (3), through the independent speed regulation of control unit (4) and motor group (3), the first stirring layer (21) realizes low-speed gas-liquid mixing and protective atmosphere circulation, the second stirring layer (22) realizes high shear homogenization and local agglomeration and breakup, and the third stirring layer (23) realizes low-speed strong bottom scraping and anti-settling, so as to realize independent control of the speed and function of the three stirring layers.

2. The electrode raw material stirring device for sodium-ion battery processing according to claim 1, characterized in that: The first stirring layer (21) includes a plurality of 45° upward-sloping blade turbine stirring blades (211), and the stirring shaft assembly includes a first rotating shaft (212) disposed on the outermost layer. The upward-sloping blade turbine stirring blades (211) are welded to the outer ring surface of the first rotating shaft (212).

3. The electrode raw material stirring device for sodium-ion battery processing according to claim 2, characterized in that: The second stirring layer (22) includes several sets of staggered shearing rods (221). The stirring shaft group includes a second rotating shaft (222) that passes through the first rotating shaft (212) and is located below it. The shearing rods (221) are fixedly welded to the outer ring surface of the second rotating shaft (222).

4. The electrode raw material stirring device for sodium-ion battery processing according to claim 3, characterized in that: The third stirring layer (23) includes a conical wheel cylinder (231), with a spirally inserted blade (232) on the outer annular surface of the conical wheel cylinder (231). The stirring shaft assembly includes a third rotating shaft (233) that passes through the first rotating shaft (212) and the second rotating shaft (222). The third rotating shaft (233) abuts against the bottom of the stirring tank (1), and the conical wheel cylinder (231) is fixedly installed on the outer annular surface of the third rotating shaft (233).

5. The electrode raw material stirring device for sodium-ion battery processing according to claim 4, characterized in that: The first rotating shaft (212) and the second rotating shaft (222) are hollow, and the third rotating shaft (233) is a solid shaft. The second rotating shaft (222) includes a first connecting part (223) that passes through the first rotating shaft (212) and a first outer part (224) with the same outer diameter as the first rotating shaft (212). The third rotating shaft (233) includes a second connecting portion (234) that passes through the second rotating shaft (222) and a second outer connecting portion (235) with the same outer diameter as the first rotating shaft (212). The concentricity of the first rotating shaft (212), the second rotating shaft (222), and the third rotating shaft (233) is ≤0.05 mm.

6. The electrode raw material stirring device for sodium-ion battery processing according to claim 5, characterized in that: A first toothed plate (31) is welded to the outer ring above the first rotating shaft (212), a second toothed plate (32) is welded to the outer ring above the second rotating shaft (222), and a third toothed plate (33) is welded to the outer ring above the third rotating shaft (233). The motor assembly (3) includes a first motor (34) driving the first rotating shaft (212), a second motor (35) driving the second rotating shaft (222), and a third motor (36) driving the third rotating shaft (233). The first motor (34), the second motor (35), and the third motor (36) are electrically connected to the control unit (4). Gears are installed on the output shafts of the first motor (34), the second motor (35), and the third motor (36), and the gears in different groups mesh with the first gear, the second gear, and the third gear respectively.

7. The electrode raw material stirring device for sodium-ion battery processing according to claim 2, characterized in that: The upward-sloping folded blade turbine agitator (211) has a 4-6 blade folded blade structure, and the blade (232) ends are upturned at an angle of 40° to 50°.

8. The electrode raw material stirring device for sodium-ion battery processing according to claim 3, characterized in that: The shearing rod (221) has a serrated side (2211) and the diameter of the shearing rod (221) is 0.45 to 0.55 times the inner diameter of the mixing tank (1).

9. The electrode raw material stirring device for sodium-ion battery processing according to claim 4, characterized in that: The conical wheel cylinder (231) has a hollow structure and is made of polytetrafluoroethylene or PEEK material.

10. The electrode raw material stirring device for sodium-ion battery processing according to claim 5, characterized in that: A sealed bearing (5) is provided between the first rotating shaft (212) and the first connecting part (223), and between the second rotating shaft (222) and the second connecting part (234).

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